linux-stable/arch/m68k/atari/stram.c
Mike Rapoport e31cf2f4ca mm: don't include asm/pgtable.h if linux/mm.h is already included
Patch series "mm: consolidate definitions of page table accessors", v2.

The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once.  For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.

Most of these definitions are actually identical and typically it boils
down to, e.g.

static inline unsigned long pmd_index(unsigned long address)
{
        return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}

static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}

These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.

For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.

These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.

This patch (of 12):

The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the
functions involving page table manipulations, e.g.  pte_alloc() and
pmd_alloc().  So, there is no point to explicitly include <asm/pgtable.h>
in the files that include <linux/mm.h>.

The include statements in such cases are remove with a simple loop:

	for f in $(git grep -l "include <linux/mm.h>") ; do
		sed -i -e '/include <asm\/pgtable.h>/ d' $f
	done

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09 09:39:13 -07:00

202 lines
4.9 KiB
C

/*
* Functions for ST-RAM allocations
*
* Copyright 1994-97 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/memblock.h>
#include <linux/mount.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <asm/setup.h>
#include <asm/machdep.h>
#include <asm/page.h>
#include <asm/atarihw.h>
#include <asm/atari_stram.h>
#include <asm/io.h>
/*
* The ST-RAM allocator allocates memory from a pool of reserved ST-RAM of
* configurable size, set aside on ST-RAM init.
* As long as this pool is not exhausted, allocation of real ST-RAM can be
* guaranteed.
*/
/* set if kernel is in ST-RAM */
static int kernel_in_stram;
static struct resource stram_pool = {
.name = "ST-RAM Pool"
};
static unsigned long pool_size = 1024*1024;
static unsigned long stram_virt_offset;
static int __init atari_stram_setup(char *arg)
{
if (!MACH_IS_ATARI)
return 0;
pool_size = memparse(arg, NULL);
return 0;
}
early_param("stram_pool", atari_stram_setup);
/*
* This init function is called very early by atari/config.c
* It initializes some internal variables needed for stram_alloc()
*/
void __init atari_stram_init(void)
{
int i;
/*
* determine whether kernel code resides in ST-RAM
* (then ST-RAM is the first memory block at virtual 0x0)
*/
kernel_in_stram = (m68k_memory[0].addr == 0);
for (i = 0; i < m68k_num_memory; ++i) {
if (m68k_memory[i].addr == 0) {
return;
}
}
/* Should never come here! (There is always ST-Ram!) */
panic("atari_stram_init: no ST-RAM found!");
}
/*
* This function is called from setup_arch() to reserve the pages needed for
* ST-RAM management, if the kernel resides in ST-RAM.
*/
void __init atari_stram_reserve_pages(void *start_mem)
{
if (kernel_in_stram) {
pr_debug("atari_stram pool: kernel in ST-RAM, using alloc_bootmem!\n");
stram_pool.start = (resource_size_t)memblock_alloc_low(pool_size,
PAGE_SIZE);
if (!stram_pool.start)
panic("%s: Failed to allocate %lu bytes align=%lx\n",
__func__, pool_size, PAGE_SIZE);
stram_pool.end = stram_pool.start + pool_size - 1;
request_resource(&iomem_resource, &stram_pool);
stram_virt_offset = 0;
pr_debug("atari_stram pool: size = %lu bytes, resource = %pR\n",
pool_size, &stram_pool);
pr_debug("atari_stram pool: stram_virt_offset = %lx\n",
stram_virt_offset);
}
}
/*
* This function is called as arch initcall to reserve the pages needed for
* ST-RAM management, if the kernel does not reside in ST-RAM.
*/
int __init atari_stram_map_pages(void)
{
if (!kernel_in_stram) {
/*
* Skip page 0, as the fhe first 2 KiB are supervisor-only!
*/
pr_debug("atari_stram pool: kernel not in ST-RAM, using ioremap!\n");
stram_pool.start = PAGE_SIZE;
stram_pool.end = stram_pool.start + pool_size - 1;
request_resource(&iomem_resource, &stram_pool);
stram_virt_offset = (unsigned long) ioremap(stram_pool.start,
resource_size(&stram_pool)) - stram_pool.start;
pr_debug("atari_stram pool: size = %lu bytes, resource = %pR\n",
pool_size, &stram_pool);
pr_debug("atari_stram pool: stram_virt_offset = %lx\n",
stram_virt_offset);
}
return 0;
}
arch_initcall(atari_stram_map_pages);
void *atari_stram_to_virt(unsigned long phys)
{
return (void *)(phys + stram_virt_offset);
}
EXPORT_SYMBOL(atari_stram_to_virt);
unsigned long atari_stram_to_phys(void *virt)
{
return (unsigned long)(virt - stram_virt_offset);
}
EXPORT_SYMBOL(atari_stram_to_phys);
void *atari_stram_alloc(unsigned long size, const char *owner)
{
struct resource *res;
int error;
pr_debug("atari_stram_alloc: allocate %lu bytes\n", size);
/* round up */
size = PAGE_ALIGN(size);
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
if (!res)
return NULL;
res->name = owner;
error = allocate_resource(&stram_pool, res, size, 0, UINT_MAX,
PAGE_SIZE, NULL, NULL);
if (error < 0) {
pr_err("atari_stram_alloc: allocate_resource() failed %d!\n",
error);
kfree(res);
return NULL;
}
pr_debug("atari_stram_alloc: returning %pR\n", res);
return atari_stram_to_virt(res->start);
}
EXPORT_SYMBOL(atari_stram_alloc);
void atari_stram_free(void *addr)
{
unsigned long start = atari_stram_to_phys(addr);
struct resource *res;
unsigned long size;
res = lookup_resource(&stram_pool, start);
if (!res) {
pr_err("atari_stram_free: trying to free nonexistent region "
"at %p\n", addr);
return;
}
size = resource_size(res);
pr_debug("atari_stram_free: free %lu bytes at %p\n", size, addr);
release_resource(res);
kfree(res);
}
EXPORT_SYMBOL(atari_stram_free);